Chevrolet Silverado / GMC Sierra. Service manual — part 2055

Fig. 92: View Of CMP Actuator & Timing Chain
Courtesy of GENERAL MOTORS CORP.

9. Align the CMP actuator so the timing mark is in the 6 o'clock position.

10. Install the CMP actuator (235) and timing chain (208). Align the hole in the face of the

CMP actuator with the locating pin on the front face of the camshaft.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Fig. 93: Inspecting For Proper Installation Of CMP Actuator & Timing Chain
Courtesy of GENERAL MOTORS CORP.

11. Place a straight edge across the front face of the engine block and inspect for proper

installation of the CMP actuator and timing chain. With the CMP actuator properly and
completely installed onto the front of the camshaft, the timing chain will not protrude

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

beyond the front face of the engine block.

Fig. 94: View Of CMP Actuator Solenoid Valve
Courtesy of GENERAL MOTORS CORP.

12. Install a NEW CMP actuator solenoid valve (234). With the CMP actuator properly

positioned onto the camshaft, the CMP actuator solenoid valve can be threaded completely
into the camshaft using light hand pressure. Tighten by hand until snug.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Fig. 95: View Of CMP Actuator Alignment Mark & Crankshaft Sprocket
Alignment Mark
Courtesy of GENERAL MOTORS CORP.

13. Inspect the sprockets for proper alignment. The mark on the CMP actuator sprocket (1)

should be located in the 6 o'clock position and the mark on the crankshaft sprocket (2)

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado